MESON Chess Problem Database

Problem Display
PID: 169253 (K7/n1p5/k7/8/1Q6/8/4R3/r7 w - - 0 1)

Lincoln, Robert A

SuperProblem, 2017

K7/n1p5/k7/8/1Q6/8/4R3/r7

#2

3 + 4

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rb1
      • 2.Ra2#
    • 1...Rc1
      • 2.Ra2#
    • 1...Rd1
      • 2.Ra2#
    • 1...Re1
      • 2.Ra2#
    • 1...Rf1
      • 2.Ra2#
    • 1...Rg1
      • 2.Ra2#
    • 1...Rh1
      • 2.Ra2#
    • 1...Ra2
      • 2.Rxa2#
    • 1...Ra5
      • 2.Qb7#
  • Tries
    • 1.Re5?
      • threat
        • 2.Qb7#
      • 1...Sb5
        • 2.Qxb5#
      • 1...Rb1
        • 2.Ra5#
        • 2.Qa5#
      • 1...c5!
    • 1.Re6+?
      • 1...Sc6
        • 2.Rxc6#
      • 1...c6!
  • Keys
    • 1.Rb2!
      • 1...Sb5
        • 2.Qxb5#
      • 1...Rb1
        • 2.Ra2#
        • 2.Qa3#
        • 2.Qa4#
      • 1...Rc1
        • 2.Ra2#
        • 2.Qa3#
        • 2.Qa4#
      • 1...Rd1
        • 2.Ra2#
        • 2.Qa3#
        • 2.Qa4#
      • 1...Re1
        • 2.Ra2#
        • 2.Qa3#
        • 2.Qa4#
      • 1...Rf1
        • 2.Ra2#
        • 2.Qa3#
        • 2.Qa4#
      • 1...Rg1
        • 2.Ra2#
        • 2.Qa3#
        • 2.Qa4#
      • 1...Rh1
        • 2.Ra2#
        • 2.Qa3#
        • 2.Qa4#
      • 1...Ra2
        • 2.Rxa2#
      • 1...Ra3
        • 2.Qxa3#
      • 1...Ra4
        • 2.Qxa4#
      • 1...Ra5
        • 2.Qb7#
      • 1...Sc6
        • 2.Qb5#
      • 1...Sc8
        • 2.Qb5#
      • 1...c5
        • 2.Qb6#
      • 1...c6
        • 2.Qb6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 7
  • Sets
    • R(a);N_GUARD::R(A)
    • R(a);N_GUARD::R(A),XR(a)
    • R(a);SBLOCK::QAB1(B)
  • Tries
    • Try
      • R(A);
      • Threat
        • QAB1(B)
      • Vars
        • S(c);N_GUARD::QAB1(B),XS(c)
      • Refutation
        • P(d);
    • Try
      • R(A);CHECK
      • Vars
        • S(c);N_GUARD,P_SPINS(c)::R(A),XS(c)
      • Refutation
        • P(d);P_SPINP(d)
  • Actual
    • R(A);
    • Vars
      • S(c);N_GUARD::QAB1(B),XS(c)
      • R(a);N_GUARD::R(A),XR(a)
      • R(a);N_GUARD::QAR(B),XR(a)
      • R(a);N_GUARD::QAR2(B),XR(a)
      • R(a);SBLOCK::QAB1(B)
      • S(c);N_GUARD::QAB1(B)
      • P(d);N_GUARD::QAR1(B)
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